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Assuming you're talking about grind by time/weight, grind by time works best if you generally use the same type of beans and use them fairly quickly (I find myself having to tighten grind as my beans age across the course of two weeks which will throw off your set timings if you want a constant weight out).
If you're going for GBW, as previously discussed you have a choice of the Sette 270Wi, Eureka Libra, maybe a Fiorenzato also around 500gbp, and everything else is going to be pretty expensive.. Have heard adjusting the grind settings on the Eureka can only be done with motor running which will waste beans if you want to keep hopper full. Sette Wi aside, most of the low-retention grinders tend to be single dose/non-weighing. I will always recommend the Sette but it can be noisy plus you have to be willing to change out the gearbox once every few years (though Baratza is good with spare parts!).
I’m thinking about moving my Rancilio Rocky on. I’m being tempted by an on demand grinder which would mean not having to endlessly weight coffee out.
What are the draw backs of on demand grinders